Bug 1734470
| Summary: | Reapply DHCPv6 only mode will still get autoconf. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Gris Ge <fge> | ||||||||
| Component: | NetworkManager | Assignee: | Beniamino Galvani <bgalvani> | ||||||||
| Status: | CLOSED ERRATA | QA Contact: | Desktop QE <desktop-qa-list> | ||||||||
| Severity: | high | Docs Contact: | |||||||||
| Priority: | high | ||||||||||
| Version: | 8.1 | CC: | atragler, bgalvani, edwardh, fgiudici, jmaxwell, lrintel, rkhan, sukulkar, thaller, till, toneata, vbenes | ||||||||
| Target Milestone: | rc | Keywords: | ZStream | ||||||||
| Target Release: | 8.2 | ||||||||||
| Hardware: | x86_64 | ||||||||||
| OS: | Linux | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | NetworkManager-1.22.0-0.1.el8 | Doc Type: | If docs needed, set a value | ||||||||
| Doc Text: | Story Points: | --- | |||||||||
| Clone Of: | |||||||||||
| : | 1772820 (view as bug list) | Environment: | |||||||||
| Last Closed: | 2020-04-28 16:53:06 UTC | Type: | Bug | ||||||||
| Regression: | --- | Mount Type: | --- | ||||||||
| Documentation: | --- | CRM: | |||||||||
| Verified Versions: | Category: | --- | |||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||
| Embargoed: | |||||||||||
| Bug Depends On: | |||||||||||
| Bug Blocks: | 1738101, 1738136, 1738635, 1772820 | ||||||||||
| Attachments: |
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The output of reproduce scripts: ==== [fge@el8 ~]$ sudo ./nm_reapply_ipv6.sh Error: unknown connection 'dhcpcli'. Error: cannot delete unknown connection(s): 'dhcpcli'. Cannot find device "dhcpcli" radvd-2.17-12.el8.x86_64 0 0 Connection 'dhcpcli' (0816d2d0-b070-4d9b-b630-5e4cc806ec48) successfully added. Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3) ::1 dev lo proto kernel metric 256 pref medium 2001:db8:1::/64 dev dhcpsrv proto kernel metric 256 pref medium fe80::/64 dev enp1s0 proto kernel metric 100 pref medium fe80::/64 dev dhcpsrv proto kernel metric 256 pref medium fe80::/64 dev dhcpcli proto kernel metric 256 pref medium Connection successfully reapplied to device 'dhcpcli'. 1 2 3 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 299sec hoplimit 64 pref medium 4 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 298sec hoplimit 64 pref medium 5 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 297sec hoplimit 64 pref medium 6 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 296sec hoplimit 64 pref medium 7 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 295sec hoplimit 64 pref medium 8 9 10 11 12 13 14 15 16 17 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 299sec hoplimit 64 pref medium 18 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 298sec hoplimit 64 pref medium 19 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 297sec hoplimit 64 pref medium 20 default via fe80::b0ec:c5ff:fedd:b7b2 dev dhcpcli proto ra metric 1024 expires 296sec hoplimit 64 pref medium rm: cannot remove '/etc/dnsmasq.d/test.conf': No such file or directory Connection 'dhcpcli' (0816d2d0-b070-4d9b-b630-5e4cc806ec48) successfully deleted. ===== autoconf routes show up at second 3, and disappear second 8, then show up again at second 17 Created attachment 1594701 [details]
System logs with NM trace enabled
Probably those addresses are added by kernel because we leave 'accept_ra' set to 1, and so kernel does autoconfiguration even when it's disabled in NM. Created attachment 1607778 [details] Script to check RA neigh parameters The branch above disables kernel handling of RAs (accept_ra), that was introduced to fix bug 1068673. The parameters mentioned in the bug (retrans_time, reachable_time) are now handled by NM. This scripts can be used to verify that we still set the parameters correctly. Requesting a backport to z-stream: RHV is not expecting traffic disruption while updating a bridge interface. The issue discussed in this BZ disrupts traffic and connectivity as it requires the usage if "activation" instead of "reapply". It will be very helpful to have this issue fixed in 8.1.z so RHV can consume it from day 1. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:1847 |
Created attachment 1594673 [details] Reproduce script. Description of problem: When reapply the change of ipv6.method ignore -> dhcp, the autoconf will got enabled after some seconds. nmcli c add type ethernet ifname dhcpcli \ connection.id dhcpcli \ ipv4.method disabled \ ipv6.method ignore nmcli c up dhcpcli nmcli c modify dhcpcli ipv6.method dhcp nmcli d reapply dhcpcli Version-Release number of selected component (if applicable): NetworkManager-1.20.0-0.3.el8.x86_64 How reproducible: 100% Steps to Reproduce: 1. Download the attached script. 2. sudo bash ./nm_reapply_ipv6.sh 3. Actual results: autoconf routes show up at second 7, and disappear second 12, then show up again at second 17: Expected results: No autoconf routes. Additional info: